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The URL (web address) shown by your browser starts with https because you visit this site using a secured connection. Note that the URI reference (identifier) of PRESSURE TEST CIRCUIT NUMBER ASSIGNMENT CLASS (dexpi) to be used in DEXPI-compliant Proteus files starts with http - as shown below:

http://sandbox.dexpi.org/rdl/PressureTestCircuitNumberAssignmentClass

PRESSURE TEST CIRCUIT NUMBER ASSIGNMENT CLASS (dexpi)

ClassOfClassOfDescription

A class to assign the number of a pressure test circuit.

Classification

Classifier

RDF Properties

"A class to assign the number of a pressure test circuit."
"PRESSURE TEST CIRCUIT NUMBER ASSIGNMENT CLASS"
"PRESSURE TEST CIRCUIT NUMBER ASSIGNMENT CLASS"

Namespaces

rdfs
http://www.w3.org/2000/01/rdf-schema#
p2
http://rds.posccaesar.org/2008/02/OWL/ISO-15926-2_2003#
rdf
http://www.w3.org/1999/02/22-rdf-syntax-ns#
pca
http://data.posccaesar.org/rdl/
dexpi
http://sandbox.dexpi.org/rdl/